We present a genome assembly from an individual male Gasterosteus aculeatus (three-spined stickleback; Chordata; Actinopteri; Perciformes; Gasterosteidae). The assembly contains two haplotypes with total lengths of 511.14 megabases and 457.35 megabases. Most of haplotype 1 (97.82%) is scaffolded into 22 chromosomal pseudomolecules, including the X and Y sex chromosomes. Haplotype 2 was assembled to scaffold level. The mitochondrial genome has also been assembled, with a length of 16.56 kilobases. This assembly was generated as part of the Darwin Tree of Life project, which produces genomes for eukaryotic species found in Britain and Ireland.
Hänfling et al. (Sat,) studied this question.